CN101868211A

CN101868211A - Absorbent articles comprising a slow recovery stretch laminate and method for making the same

Info

Publication number: CN101868211A
Application number: CN200880117221A
Authority: CN
Inventors: 戴维·H·梅里克; 珍妮特·内顿
Original assignee: Procter and Gamble Ltd
Current assignee: Procter and Gamble Ltd; Procter and Gamble Co
Priority date: 2007-11-21
Filing date: 2008-11-21
Publication date: 2010-10-20
Anticipated expiration: 2028-11-21
Also published as: US20090134049A1; US8323257B2; EP2211811A1; BRPI0820204A2; CN101868211B; MX2010005529A; CA2706072A1; WO2009066268A1; CA2706072C; JP2011502689A

Abstract

An absorbent article may comprise a topsheet, a backsheet joined with the topsheet, an absorbent core interposed between the topsheet and backsheet; and a slow recovery stretch laminate. The slow recovery stretch laminate may be joined to one or more article elements selected from the group consisting of the topsheet, the backsheet, the core, an anal cuff, an elasticized topsheet, a fastening system, a leg cuff, a waist elastic feature, a side panel, an ear, and combinations thereof. The slow recovery stretch laminate may exhibit an unload force at 37 DEG C of about 0.16N/(g/m) or greater and a percent of initial strain after 15 seconds of recovery at 22 DEG C of about 10% or greater. And, the slow recovery stretch laminate may comprise an elastic member that was pretreated prior to and/or during draw down of the elastic member.

Description

Comprise absorbent article of slow recovery stretch laminate and preparation method thereof

Invention field

The present invention relates to comprise the absorbent article of slow recovery stretch laminate and the method that is used to prepare described slow recovery stretch laminate, described absorbent article such as diaper, training pants, adult incontinence product, feminine hygiene article etc.

Background of invention

Stretch laminate is known by people in this area.People know the absorption plant that has stretch laminate at disposable absorbent article field expectation structure already, as have a disposable diaper, pull-on diaper, training pants, sanitary towel, Pantiliner, incontinence briefs etc. of fastener, with the comfortableness of improving motion and keep the stickiness that continues.In addition, stretch laminate makes diaper can adapt to the wearer of different body sizes.Diaper can have stretch laminate in its many goods elements, described film-making element comprises belt, lower limb hoop, lateral plate, elasticated topsheet, egative film, auricle, outer covering piece and fastening system.

When wearing, diaper generally can be stretched and from its initial basic compactness and relaxed state vertically and/or transverse extension.When discharging the tension force of elongation, diaper is successfully worn at it usually, and the wearer bounces back on one's body or before the wearer adjusts on one's body, compression and/or folding.In traditional gluing diaper, can be present in the lower limb hoop stretch laminate wear the wearer may need on one's body the elongation.Yet if do not keep successive power, the stretch laminate in the lower limb hoop can cause diaper to bounce back fast.Usually, the nursing staff need apply successive tensile force to diaper, simultaneously diaper is placed on one's body the wearer, and the wearer that nursing may not too cooperate in wearing the process of diaper (for example, cry and shout, cry, touch, resistance etc.).The demand of these a plurality of whiles can cause nursing staff's worries.The demand of a plurality of whiles may cause diaper suitably to be worn on one's body the wearer.

Equally, in trousers type goods, can be present in waist feature, lateral plate, lower limb encloses or outer covering piece in stretch laminate may need elongation so that from initial compression and tension amplification waist opening not.In application process, need apply successive power to offset otherwise the quick retraction of contingent stretch laminate by nursing staff or wearer usually.Leg opening in the trousers type goods mixes stretch laminate usually and also can be tending towards quick retraction, thereby increases the difficulty that goods is pulled upwardly to desired location on wearer's lower body.Applying successive power may be difficult to child with the waist opening of keeping increase, lacks the muscular strength of the hand and motility because they apply continuous force when wearing medicated underpants.Equally, the old man applies the muscular strength of the hand and the motility that continuous force also lacks necessity when wearing incontinence articles.

In addition, nearest diaper improves acceptance and the storage of being absorbed in feces.In the design of conventional diaper, feces is retained between diaper topsheets and the wearer's skin.The result is that the wearer suffers excess contamination, stimulation and the possible leakage around the lower limb hoop usually.The improvement of diaper design comprises the elasticated topsheet that uses perforate so that feces separates with wearer's skin, thus the seepage of preventing and stimulation.The elasticated topsheet of perforate forms the space between this elasticated topsheet and the diaper structure below it.Stretch laminate links to each other to help keeping elasticated topsheet to contact wearer's skin basically with elasticated topsheet usually.In addition, stretch laminate helps the location of retaining hole, thereby makes following diaper structure can accept the feces invasion and attack.The example of elasticated topsheet can be present among U.S. Patent Publication 2005-0273071,2005-0171499,2007-0191806,2004-0162538 and the 2005-0095942.

Although elasticated topsheet conceptive be favourable, have the diaper that comprises conventional elastomeric elasticated topsheet and be difficult to usually wear.Wearing diaper needs the nursing staff to stretch diaper so that make it be in basic plan-position.During release, the retraction rate of stretch laminate makes that the nursing staff is difficult to diaper is applied on one's body the wearer snugly.This " fast retraction " of elasticated topsheet can increase diaper is worn wearer's difficulty on one's body.If diaper is difficult to wear, then be tending towards making hole dislocation, this can cause feces to be deposited on the elasticated topsheet but not pass the hole.The dislocation in hole can destroy and make feces and the isolating beneficial effect of wearer's skin.The embodiment that comprises the diaper of the foraminous elasticated topsheet of tool has been disclosed in the U.S. Patent Publication 4,892,536 of authorizing people such as Des Marais and has authorized in the U.S. Patent Publication 4,990,147 of Freeland.

Therefore, absorbent article is necessary to be included in the stretch laminate that slowly bounces back when extended state discharges, thereby helps product is correctly worn and navigates on one's body the wearer.

Satisfy stretch laminate when discharging by extended state slowly retraction needs and a problem existing is that stretch laminate is a mixtures of material.Stretch laminate can comprise elastic member and relative stiff substrate usually.Elastic component can for example engage by binding agent by bonding technology known in the art with substrate.These combinations of materials are that laminated material just is bound to cause slow recovery just.In addition, forming technique can influence the recovery characteristics of gained stretch laminate.For example, stretching adhesive linkage platen press relate to will the tension elastic component join in the stiff basically substrate.When adaptability to changes discharged, elastic component bounced back and can make the substrate pinching.The initial strain of elastic component can influence the extendability and the recovery characteristics of stretch laminate.The structure of substrate and basic weight also can influence the recovery characteristics of stretch laminate.

Another problem that satisfies the needs of slow recovery stretch laminate and exist is that elastic component should be tightened up relatively equably so that described laminated material has consistent characteristic and therefore provides reliable performance for the end user during described stretch laminate manufacturing.In addition, for economic reasons, advantageously with the woven stretch laminate of the continuation method of high line speed, described method further makes the manufacturing of the slow recovery stretch laminate with unfailing performance complicated then.This additional complexity mainly is because the higher characteristic strain rate that elastic component experiences under high line speed.With regard to given stretching laminating method and operative temperature, along with line speed increases, strain rate also will increase, and higher strain rate easier stability problem that causes in drawing process.

Summary of the invention

In response to above-indicated problem, the invention provides and comprise top flat, the egative film that engages with top flat, place the absorbent cores between top flat and the egative film and the absorbent article of slow recovery stretch laminate.In addition, the present invention also provides the reliable slow recovery stretch laminate made from continuation method.Slow recovery stretch laminate in the absorbent article element is showing about 0.16N/ (g/m) or bigger off-load power and is showing about 10% or bigger initial strain percentage ratio after recovering for 15 seconds down at 22 ℃ under 37 ℃.Slow recovery stretch laminate can be included in before the stretching of elastic component and/or during pretreated elastic component, described pretreatment is or combination during preheating, prestretched and increment stretch.In addition, elastic component shows following one or more characteristics: (i) about 0.3MPa or littler yield stress are fallen under the characteristic strain rate of drawing process and characteristic temperature, (ii) under the characteristic strain rate of drawing process and characteristic temperature about 30% or littler percentage ratio yield stress fall, (iii) fall at about 0.15MPa under the incipient extension strain rate of the characteristic strain rate that equals drawing process and under the characteristic temperature of drawing process or littler yield stress, and (iv) under the incipient extension strain rate of the characteristic strain rate that equals drawing process with the characteristic temperature of drawing process under about 20% or littler percentage ratio yield stress fall.

In addition, the invention provides a plurality of absorbent articles that are included in the packing, each absorbent article in its intermediate package comprises top flat, the egative film that engages with top flat, places absorbent cores and goods element between top flat and the egative film.

At least one goods element of each absorbent article in being used to pack can comprise slow recovery stretch laminate, described stretch laminate show under 37 ℃ about 0.16N/ (g/m) or bigger off-load power and 22 ℃ down recovery show about 10% or bigger initial strain percentage ratio after 15 seconds.Slow recovery stretch laminate shows less than about 15% the percentage ratio coefficient of variation and for the percentage ratio coefficient of variation that shows 22 ℃ of initial strains after recovering for 15 seconds down less than about 15% for the off-load power under 37 ℃.

Summary of drawings

Figure 1A to 1E is the perspective view of slow recovery stretch laminate embodiment.

Fig. 2 is for the example that shows engineering stress-strain curve of surrendering the material that falls.

Fig. 3 is for the example that does not show engineering stress-strain curve of surrendering the material that falls.

Fig. 4 is the illustration that two circulation applying test set configurations and test sample load.

Fig. 5 is the sketch map that is used to form the once step stretching laminating method of slow recovery stretch laminate.

Detailed Description Of The Invention

As used herein, term " absorbent article " or " goods " refer to absorb and/or the universal device of receiving fluids, more particularly refer to be close to wearer's health or contiguously place to absorb and hold device by the various effluents of health discharging. Suitable example comprises diaper, training pants, pull-on garment, adult incontinence products and such as the feminine care of sanitary napkin. In addition, " absorbent article " comprise be intended to abandon or do not prepare washing or in other words be no more than use for ten times after, preferably be no more than use for five times after, and no longer preserve " disposable absorbent article " of (although some assembly recyclable, re-use or compost treatment) after most preferably single uses.

As used herein, term " stretch laminate " generally refers to be attached to the elastomer at least a material such as thin polymer film, non-woven material, weaving material or the scrim. Elastomer can be by any being attached on the material in many adhesive methods known to those skilled in the art, and described adhesive method comprises adhesives, hot adhesion, pressure bonding, ultrasonic bonding etc. or their any combination.

As used herein, term " laminated material " refers to comprise the material of two or more layers. This term comprises stretch laminate and non-stretching layered product.

As used herein, term " diaper " is meant the absorbent article of generally being worn around lower body by baby and incontinent person.

As used herein, term " substrate " is meant and is laminated on the elastic component to form the material of stretch laminate.Suitable substrate comprises non-woven webs, woven web, knit goods, thin film, film laminate, perforated film, nonwoven laminates, sponge, foam, scrim and their any combination.Suitable substrate can comprise natural material, synthetic material or their any combination.

As used herein, term " vertically " generally is meant the direction parallel with the longitudinal axis of goods, and comprises the direction in vertical 45 ° of scopes.

As used herein, " length " of term goods or its assembly typically refers to the size/distance of the maximum linear dimension of goods or its parts, perhaps typically is meant the size/distance of longitudinal axis.

As used herein, term " side direction " or " laterally " be meant the direction that is orthogonal to usually vertically and is parallel to axis of pitch.

As used herein, " width " of term goods or its assembly be meant be orthogonal to goods or its assembly vertically (for example, be orthogonal to the length of goods or its assembly) size/distance, and typically refer to the size distance/size of the axis of pitch that is parallel to goods or assembly.

As used herein, term " attached " comprises by element directly being attached on other element and this element directly is fixed to configuration on another element.

As used herein, term " joint " or " connection " comprise wherein by first element directly is attached to makes first element directly be fixed to configuration on second element on second element, and by first element is attached on the intermediate member, intermediate member is attached to then on second element and makes first element be fixed to configuration on second element indirectly." joint " or " connection " element can adhere to continuously or intermittently.

As used herein, " relaxing " or " relaxed state " is meant the state that does not have power to be applied to (except naturally occurring power such as gravity) on the goods.

As used herein, term " extendability " and " ductile ", for example elastomeric extendability is meant the element width that is in slack position and length is extensible or increase.

As used herein, " elastification " or " but elastification " is finger assembly comprises at least a portion of being made by elastomeric material.

As used herein, term " elastic ", " elastomer " and " elastomeric " are meant and generally can extend at least 50% strain and can not rupture or break and can return to the material of its original dimension substantially after deformation force removes.

As used herein, term " curable product " is meant operation dress and surgical drage, face shield, headgear, shoe cover, wound dressing, binder and sterilization wrappage, and is as U.S. Patent Publication 5,540, disclosed in 976.

As used herein, term " copolymer " is meant by the synthetic polymer of two or more monomers with different chemical structures.

As used herein, term " temperature-responsive " and " temperature-responsive " are meant that slow recovery stretch laminate is through strain after ratio shows less elongation at a lower temperature under higher temperature after the specified time period.

As used herein, term " conventional stretch laminate " is meant as extending the back and recovers test stretch laminate measured, show minimum initial strain percentage ratio after recovering for 15 seconds under 22 ℃.As extending the back, to recover test measured, and conventional stretch laminate is at 22 ℃ of initial strain percentage ratios that show after recovering for 15 seconds down less than 10%.

As used herein, term " the initial strain percentage ratio of reservation " be meant as extend the back recover test measured discharge by initial strain after a period of time after the initial strain percentage ratio that keeps." the initial strain percentage ratio of reservation " calculates divided by the initial percentage strain by using by the percent strain of initial strain release back during preset time; The gained merchant be multiply by 100 obtain percentage ratio.

As used herein, term " stress ", " engineering stress " and " nominal stress " are meant the first beginning and end distortion cross-sectional area of the sample that load is applied to it divided by deformation force.

As used herein, the first beginning and end deformation length of the sample that the change that term " strain " and " engineering strain " are meant sample length is applied to it divided by deformation force is typically expressed as percentage ratio.

As used herein, term " yield point " is meant that engineering stress is to the point on the strain curve, surpassing this point deformation then can not recover fully, term " yield stress " is meant the engineering stress value at yield point place, and term " yield strain " is meant the degree of strain at the yield point place that is typically expressed as percent strain.Some material also shows " surrender is fallen ", and promptly engineering stress increases along with strain and reduces.

As used herein, with regard to showing the material that falls of surrender, term " surrender back minimum stress " be meant engineering stress to strain curve upper minimum stress value between yield stress and fracture or failure strain.

As used herein, with regard to showing the material that falls of surrender, term " yield stress is fallen " is meant that yield value of stress deducts surrender back minimum stress value.Term " the percentage ratio yield stress is fallen " is meant that the ratio that yield stress is fallen with yield stress multiply by 100.

As used herein, term " breaking strain ", " failure strain " and " limiting strain " are meant the maximum tension strain that material can bear before fracture, and through being often expressed as percent strain.

As used herein, term " reliably " is meant what comprise the slow recovery stretch laminate (SRSL) made with continuation method (for example gives the article made to order element, the anus hoop, elasticated topsheet, fastening system, the lower limb hoop, the waist elasticity assembly, lateral plate, auricle, outer covering piece etc.) in for the low coefficient of variation of every kind of performance of being paid close attention to (for example, as the test that lags behind by following two circulations measured the low coefficient of variation of 37 ℃ of following off-load power and as recover by following elongation back test measured 22 ℃ of low coefficient of variation of the initial strain percentage ratio after 15 seconds of recovery down).The coefficient of variation (that is the percentage ratio coefficient of variation) that is expressed as percentage ratio is meant that the ratio of standard deviation and arithmetic average multiply by 100.For a variety of reasons, can expect to be lower than about 15% or about 10% for every kind of this value of the property retention of being paid close attention to.Therefore, when the goods element in the absorbent article comprised slow recovery stretch laminate, expectation all kept below about 15% or about 10% the percentage ratio coefficient of variation for slow recovery stretch laminate in off-load power under 37 ℃ and the initial strain after recovering for 15 seconds under 22 ℃; Wherein each percentage ratio Variation Lines number average is based on arithmetic average that measurement obtained and standard deviation by five slow recovery stretch laminates, described slow recovery stretch laminate is taken from the same position on each that is included in five interior absorbent articles of selecting at random of one or more external members (for example, the gluing diaper packing of consumer's size of same absorbent goods, the pull-on diaper trousers packing of consumer's size, the feminine hygiene pads of consumer's size are packed substantially).Each external member has in those examples of five or more a plurality of absorbent articles therein, the percentage ratio coefficient of variation of the percentage ratio coefficient of variation of the off-load power under 37 ℃ and initial strain after 22 ℃ were recovered for 15 seconds down should by take from five absorbent articles of selecting at random that are included in the single external member each on five slow recovery stretch laminates of same position determine.

When absorbent article comprise more than one contain the goods element of slow recovery stretch laminate the time, the every based article element that comprises slow recovery stretch laminate is measured the percentage ratio coefficient of variation; And with regard to every based article element, measure for the percentage ratio coefficient of variation in off-load power under 37 ℃ and the initial strain after recovering for 15 seconds under 22 ℃.With regard to every based article element and character measurement, the percentage ratio coefficient of variation is based on arithmetic average that measurement obtained and the standard deviation by five slow recovery stretch laminates, and described slow recovery stretch laminate is taken from the same position in five absorbent articles of selecting at random in the one or more external members that are included in identical substantially absorbent article each.With regard to the every based article element that comprises slow recovery stretch laminate, can expect to keep below about 15% or about 10% the percentage ratio coefficient of variation in off-load power under 37 ℃ and the initial strain after recovering for 15 seconds under 22 ℃ for slow recovery stretch laminate.For example, if absorbent article comprises lower limb hoop that contains slow recovery stretch laminate and the elasticated topsheet that comprises slow recovery stretch laminate, then as mentioned above for lower limb hoop and elasticated topsheet separated measuring the off-load power under 37 ℃, 22 ℃ after recovering for 15 seconds down initial strain and the percentage ratio coefficient of variation of every kind of character.With regard to this example, to determine that four character measurements and four the percentage ratio coefficient of variation-(1) are for the off-load power of lower limb hoop under 37 ℃, (2) for the initial strain of lower limb hoop after recovering for 15 seconds under 22 ℃, (3) for the off-load power of elasticated topsheet under 37 ℃, (4) for the initial strain of elasticated topsheet after recovering for 15 seconds under 22 ℃, (5) for the percentage ratio coefficient of variation of the off-load power of lower limb hoop under 37 ℃, (6) for the percentage ratio coefficient of variation of lower limb hoop 22 ℃ of initial strains after down recovering for 15 seconds, (7) for the percentage ratio coefficient of variation of the off-load power of elasticated topsheet under 37 ℃, and (8) are for the percentage ratio coefficient of variation of elasticated topsheet 22 ℃ of initial strains after recovering for 15 seconds down.

As used herein, term " characteristic strain rate " is meant the average strain rate of elastic component experience during the stretched portion that slow recovery stretch laminate is made.

As used herein, term " characteristic temperature " is meant the mean temperature of elastic component experience during the stretched portion of slowly recovering the laminated material manufacturing.

As used herein, term " stretching " is meant by than process feeds speed tractive elastic component and elastic component is stretched quickly.In continuation method, this is generally by utilizing difference roller speed to realize with control level of stretch and characteristic strain rate.

As used herein, term " in line strain " is meant the percent strain degree that elastic component is stretched during the stretching.

As used herein, term " incipient extension strain rate " is meant that material is with the initial strain rate of experience when extending in the test of the standard tensile described in ASTM D 882.The incipient extension strain rate equals the chuck rate of departure divided by the initial distance between the chuck.

As used herein, term " elastic tensile modulus " or " Young's modulus " are measured for material stiffness.For thin material (thickness is less than about 1.0 millimeters), elastic tensile modulus can be measured according to ASTM D 882; And for thick material (thickness greater than about 1.0 millimeters and less than about 14 millimeters), elastic tensile modulus can be measured according to ASTM D 638.

Absorbent article of the present invention comprises slow recovery stretch laminate.Slow recovery stretch laminate can be used in the absorbent article of elasticity of demand performance wherein.Slow recovery stretch laminate generally comprises the elastic component that is connected with substrate.Slow recovery stretch laminate can disperse and form and engage with absorbent article.On the contrary, slow recovery stretch laminate can be in aggregates with absorbent article (for example, elastic component is connected to form stretch laminate with existing substrate such as top flat in the absorbent article).Elastic component can be made by the compositions that comprises a kind of elastomer polymer, optional at least a modified resin and optional one or more additives.Measured as the test that lags behind by following two circulations, slow recovery stretch laminate shows the normalization off-load power at least about 0.16N/ (g/m) under 37 ℃.Measured as recover test by following elongation back, slow recovery stretch laminate 22 ℃ down recovery show about 10% or bigger initial strain percentage ratio after 15 seconds.

In another embodiment of the invention, slow recovery stretch laminate can be incorporated in curable product such as operation dress, face shield, headgear, shoe cover, wound dressing, binder or the sterilization wrappage.Slow recovery stretch laminate can be used in the curable product of elasticity of demand characteristic location.

Shown in Figure 1A to 1E, slow recovery stretch laminate 10 generally comprises the elastic component 12 that is connected with substrate 14.Elastic component 12 can be undertaken by multiple adhesive method with being connected of substrate 14, the combination of described method such as hot adhesion, pressure bonding, ultrasonic bonding, mechanical adhesion, adhesives or any other suitable method of attachment known in the art or these methods of attachment.In certain embodiments, elastic component 12 shows enough cohesivenesses to connect elastic component 12 and substrate 14.

Elastic component 12 with various ways can be used in the slow recovery stretch laminate 10.The suitable form that is used for elastic component 12 includes but not limited to thin film, belt, strand, single fiber, scrim, crosshatch arrangement, foam or their combination.

Figure 1A to 1E has described several suitable embodiments of slow recovery stretch laminate 10.Figure 1A has described to have the slow recovery stretch laminate 10 of the elastic component 12 of one or more belts that are connected with substrate 14 or ribbon form.Figure 1B has described to have the slow recovery stretch laminate 10 of the flap elastic member 12 that is connected with sheet form base 14.Elastic component 12 and substrate 14 are shown as and are connected.Yet arbitrary layer also can have the size that is different from another layer.Fig. 1 C has described to have the slow recovery stretch laminate 10 of the elastic component 12 of one or more strand forms that are connected with substrate 14.

Fig. 1 D has described to have the slow recovery stretch laminate 10 of the elastic component of one or more crosshatch spread patterns that are connected with substrate 14.Crosshatch is arranged can be by forming a plurality of elastic component 12a joined in parallel in an example to substrate 14.But more than second elastic component 12b joined in parallel is to substrate.More than second 12b can join on more than first 12a by non-parallel configuration.Crosshatch is arranged also and can be formed by the hot needle point method of elastomer thin film.Crosshatch is arranged also can be formed at the expansible 3 d elastic body fleece of porous macroscopic view, described in U.S. Patent Application Publication 2004/0013852.How this announcement has been described by forming thin film on the porous shaped structure and applying fluid pressure difference along the thickness of thin film and has been realized that crosshatch arranges.Fluid pressure difference makes thin film conform to supporting construction and breaks, and arranges thereby produce crosshatch.Fig. 1 E has described to have the slow recovery stretch laminate 10 of one or more elastic components 12, and described elastic component is connected with two or more substrates: the first substrate 14a and the second substrate 14b.The concrete order that slow recovery stretch laminate is 10 layers can change.Yet, in described embodiment, elastic component 12 be arranged between the first substrate 14a and the second substrate 14b and can be bonded to one of substrate or two substrates on.First substrate and the second substrate 14a, 14b can comprise identical or different material.

Other suitable embodiment of slow recovery stretch laminate 10 comprises to be utilized as common unsettled U.S. Patent application 11/145, disclosed stretch zones in 353, described patent application is filed on June 3rd, 2005 with people's such as McKiernan name, it requires the priority of the U.S. Provisional Application 60/643,920 of submission on January 10th, 2005.

The technology that forms stretch laminate is known by people in this area, and these technology can be suitable for forming slow recovery stretch laminate 10 of the present invention.The technology that is used to form stretch laminate of a kind of being commonly referred to " it is bonding to stretch " relates to when elastic component is in the stretching configuration and will be connected with substrate such as the elastic component of elastic strands, belt, ribbon, thin film etc.In general, elastic component can be stretched at least 25% of its relaxed length.After the connection, elastic component can relax, thus pinching substrate and form stretch laminate.

Another technology that is used to form stretch laminate that is commonly referred to " constriction is bonding " relates to when base extension and constriction elastic component is bonded in the substrate.In certain embodiments, substrate can be non-resilient substrate.The case description of the bonding layered product of constriction is in U.S. Patent Publication 5,226, in 992,4,981,747,4,965,122 and 5,336,545.The variant of " neck-bonded " is " a neck stretch-bonded ".The neck stretch-bonded is meant when base extension and constriction and elastic component extension elastic component is bonded in the substrate.The case description of neck stretch-bonded layer material is in U.S. Patent Publication 5,114, in 781 and 5,116,662.

In forming another technology of stretch laminate, elastic component configuration or the part configuration that stretches that can relax is attached in the substrate.Can the gained layered product can be stretched (perhaps part stretch easier stretching under strand or the thin film situation) by making layered product stand the elongation method, described elongation method be permanently extended substrate, but elasticity of elongation member temporarily.These class methods known in the art be " zero strain " stretch laminate forming method, and available suitable components of the elongation of this type of layered product such as realizations such as roller, engaging tooth.The formation of the example of zero strain activation method and gained stretch laminate is described in United States Patent (USP) 5,167, in 897 and 5,156,793.

The alternative technology that is used to form stretch laminate is disclosed among U.S. Patent Application Publication 2003/0088228A1,2003/0091807A1 and the 2004/0222553A1.The technology that is disclosed in these announcements relates to following formation elastic component: one or more thermoplastic elastomer (TPE) heat fusings are coated in the substrate, and the increment elongate substrate is to give elastomeric tensile properties to substrate subsequently.Suitable coating method comprises for example directly intaglio printing, flexographic printing and flexographic printing.In these methods each makes a certain amount of elastomer with Any shape and direction deposition, therefore provides basic pliability in the tensile properties that stretch laminate shows.Other conventional method that is used for stretch laminate formation is also in the scope of this description.

In addition, in order to produce reliable slow recovery stretch laminate, importantly in whole stretch zones, realize strain characteristics relatively uniformly.Show the material that falls of surrender and can during stretching, have stability problem, for example change of thickness, thus generally can obtain having the laminated material of height performance change.It is more not obvious that increase draft temperature, reduction strain rate and/or prestretched elastic component can make surrender fall, thereby improve the chance that is used for realizing more uniform strain characteristics.So cause the manufacturing of more reliable stretch laminate.

Elastic component 12 can comprise elastomer polymer, optional at least a modified resin and one or more optional additives.Many elastomer polymers can be used to prepare elastic component 12 alone or in combination.Elastomer polymer includes but not limited to homopolymer (for example crosslinked poly-(isoprene)), block copolymer, random copolymer, alternate copolymer and graft copolymer.Suitable elastomer polymer comprises styrene block copolymer, natural and synthetic rubber, polyisoprene, neoprene, polyurethane, silicone rubber, olefin elastomer, ionomer etc.

In one embodiment, elastomer polymer can be block copolymer.Can utilize many block copolymers that comprise segmented copolymer, tapered block copolymer and star block copolymer.In general, be applicable to that block copolymer of the present invention can demonstrate flexibility and thermoplastic characteristics simultaneously.In this based block copolymer, hard block (or fragment) can have greater than about 25 ℃ glass transition temperature (Tg), perhaps for having crystal or the semi-crystal that is higher than about 25 ℃ melt temperature (Tm).Preferably, hard block has greater than about 35 ℃ glass transition temperature, perhaps for having crystal or the semi-crystal that is higher than about 35 ℃ melt temperature.The hard block part is usually derived from the vinyl monomer that comprises vinyl-arene, as styrene and α-Jia Jibenyixi or their combination.

Glass transition temperature as referred to herein is measured by the tension force dynamic mechanical analysis that uses temperature-raising method to carry out in the linear elastic region of material with the frequency of 1Hz.Film sample with about 0.3mm uniform thickness can be used for about 1 ℃/min or slower heating rate aptly.Tan δ peak temperature is considered to the glass transition temperature of certain material or phase.

The crystalline melt temperature of mentioning herein utilizes the heating rate of 10 ℃/min to pass through determine with dsc method.Take the fusion endotherm peak temperature as melt temperature for specific crystal region.

Block copolymer can comprise soft segment (or fragment).Soft segment generally shows enough low glass transition temperature and/or melt temperature, thereby can not form glass zone or crystal region under the serviceability temperature of copolymer.In one embodiment, serviceability temperature can be between about room temperature (about 22 ℃) and about body temperature (about 37 ℃).Yet other serviceability temperature also is feasible and belongs to scope of the present invention.This type of soft segment is general incompatible with hard block physics and form independent zone, field or mutually.

Soft segment partly can be derived from any conjugated aliphatic polymer of monomers.Usually, the monomer that is used for synthetic soft segment comprises and is less than about 6 carbon atoms.Suitable diene monomers comprises butadiene, isoprene etc.Especially preferred soft segment polymer comprises poly-(butadiene) and poly-(isoprene).In addition, it is envisaged that soft segment can be modified to adapt to the glass transition temperature of soft segment.For example, can use the grafting on poly-(isoprene) of isoprene and cinnamic random copolymer or styrene.Under this type of situation, can use the modified resin of lower content.

Be used for suitable block copolymers of the present invention and can comprise at least one hard block (A) and at least one soft segment (B).Block copolymer can have a plurality of blocks.In a preferred embodiment, block copolymer can be A-B-A triblock copolymer, A-B-A-B Tetrablock copolymer or A-B-A-B-A five block copolymers.In addition, what can be used for this paper is the triblock copolymer with end block A and A ', and wherein A can be derived from different vinyl compounds with A '.In addition, can be used for of the present invention is the block copolymer with an above hard block and/or an above soft segment, and wherein each hard block can be derived from identical or different monomer, and each soft segment can be derived from identical or different monomer.Should be pointed out that in comprising the copolymer of remaining olefinic double bond copolymer partly hydrogenation or all hydrogenation as required.Saturated generation beneficial effect aspect the elastic performance of copolymer usually.

Elastic component 12 generally can comprise about by weight 20% elastomer polymer to about 100% content.In other suitable embodiment, elastic component 12 generally can comprise about 30% elastomer polymer to about 65% content.Alternatively, elastic component 12 generally can comprise about 45% elastomer polymer to about 60% content.

In suitable embodiment, elastomer polymer comprises styrene-alkene-styrene triblock copolymer such as s-B-S (S-B-S), styrene-ethylene/butylene-styrene (S-EB-S), styrene-ethylene/propylene-styrene (S-EP-S), styrene-isoprene-phenylethene (S-I-S), hydrogenant polystyrene-isoprene/butadiene-styrene (S-EEP-S) and their mixture.Block copolymer can adopt separately or adopt with the blend of block copolymer, and partly hydrogenation or all hydrogenation.

In specific embodiments, elastomer polymer comprises s-B-S (S-B-S) and styrene-isoprene-phenylethene (S-I-S) block copolymer.This type of linear block copolymers of s-B-S (S-B-S) and styrene-isoprene-phenylethene (S-I-S) names Vector from Dexco Polymers L.P. (Houston with commodity, TX) commercially available and with commodity names Kraton from Kraton Polymers (Houston, TX) commercially available.

Elastic component 12 can comprise one or more modified resin.Suitable modified resin should be preferably with the soft segment of elastomer polymer in conjunction with or mix mutually.Elastic component 12 can comprise about by weight 0% modified resin to about 60% content.In other embodiments, elastic component 12 can comprise about 20% modified resin to about 55% content.In certain embodiments, elastic component 12 can comprise about 40% modified resin to about 50% content.

The suitable modified resin that can be used for this paper can have about 60 ℃ to about 180 ℃, more preferably from about 70 ℃ to about 150 ℃, and more preferably from about 90 ℃ to about 130 ℃ glass transition temperature.

Suitable modified resin can combine with soft segment.Solubility parameter is used to determine whether modified resin will mix mutually with the soft segment of block copolymer.In general, select modified resin so that the solubility parameter of described modified resin is similar to the solubility parameter of soft segment phase.For example at the about 8 (cal/cm of the solubility parameter of soft segment phase ³) ^1/2Situation under, the solubility parameter of modified resin can be about 7.5 (cal/cm ³) ^1/2To about 8.5 (cal/cm ³) ^1/2The solubility parameter of modified resin also can be near the dissolubility of hard block.Yet as long as modified resin mixes mutually with soft segment, hard block does not mix mutually and should be restricted.Common polymer or dissolving resin degree parameter list are determined or are estimated that the method for solubility parameter is found in Polymer Handbook, the third edition, Wiley Interscience, VII part, the 519th to 559 page together with being used for.

The modified resin that can be used for this paper includes but not limited to unhydrided C5 hydrocarbon resin or C9 hydrocarbon resin, partial hydrogenation and whole hydrogenant C5 hydrocarbon resin or C9 hydrocarbon resin; Alicyclic resin; Terpene resin; Polystyrene and styrene oligomer; Poly-(t-butyl styrene) or its oligomer; Colophonium and rosin derivative; The benzofuran indenes; Dicyclopentadiene and oligomer thereof; Polymethylstyrene or its oligomer; Phenolic resins; Indene polymer, oligomer and copolymer; Acrylate and methacrylate ester oligomer, polymer or copolymer; Their derivant; And their combination.Preferably, resin is selected from the group of being made up of following material: derived from t-butyl styrene, cyclopentadiene, methacrylate isobornyl thiocyanoacetate, methylmethacrylate, methacrylate isobutyl ester, indenes, benzofuran, vinyl cyclohexane, methyl styrene and methacrylate-3,3, the oligomer of 5-trimethylcyclohexyl, polymer and/or copolymer.Preferred modified resin also comprises alicyclic terpenes, hydrocarbon resin, alicyclic resin, poly--nopinene, terpene phenolic resin and their combination." C5 hydrocarbon resin " and " C9 hydrocarbon resin " are disclosed in U.S. Patent Publication 6,310, in 154.

Elastic component 12 can comprise multiple additives.Can adopt and comprise that the suitable additive of stabilizing agent, antioxidant and antibacterial for example prevents thermal degradation, oxidative degradation and the biochemical degradation of elastic component 12.In general, additive can account for about 0.01% to about 60% of elastic component 12 gross weights.In other embodiments, compositions comprises about 0.01% to about 25% additive.In other suitable embodiment, compositions comprises about by weight 0.01% to about 10% additive.

Various stabilizing agents and antioxidant are known by people in this area, and comprise high-molecular weight hindered phenol (promptly, phenolic compound with space macoradical of similar hydroxyl), polyfunctional group phenol (promptly, phenolic compound with sulfur-bearing and phosphorus-containing groups), phosphate, as three-(p-nonyl phenyl) phosphites, hindered amine and their combination.Proprietary commercial stabilizing agent and/or antioxidant can comprise multiple

With

Many trade names of product are buied.

Elastic component 12 can comprise multiple antibacterial known in the art.Chemical compound such as mercurial, zinc compound and tin compound that the example of suitable antibacterial comprises benzoate, phenol, aldehyde, the chemical compound that comprises halogen, nitrogen compound and comprises metal.Its representative can commodity name Irgasan PA derive from Ciba Specialty Chemical Corporation (Tarrytown, NY).

Other optional additive comprises hard block or the associating thermoplastic polymer of the sheet phase failure or the thermoplastic polymer composition of preferred and block copolymer.Be not bound by theory, it is believed that these thermoplastic polymers are incorporated in the winding three-dimensional net structure of hard phase.Tension force, elasticity and stress relaxation characteristic that the network structure of this winding can provide elastic composition to improve.When elastomer polymer comprises styrene block copolymer, thermoplastic polymer additive such as polyphenylene oxide and can be used among the present invention derived from the monomeric aromatic ethylene polymer, other alkyl phenylethylene derivative, vinyltoluene and their mixture that comprise styrene, α-Jia Jibenyixi, p-methylstyrene, this is because they generally are considered to compatible with the styrene hard block chemistry of block copolymer.

Elastic component 12 can comprise viscosity modifier, processing aid, slip agent or anticaking agent.Processing aid comprises processing oil, and it is known for people in this area and comprises artificial oil and natural oil, naphthenic oil, paraffin oil, olefin oligomer and low-molecular weight polymer, vegetable oil, animal oil and this analog derivative that comprises the hydrogenation type.Processing oil also can mix the combination of this type of oil.Especially preferred processing oil is a mineral oil.Viscosity modifier is also known by people in this area.For example, petroleum derived wax can be used for reducing the viscosity of slow recovery elastomer in heat treatment.Suitable wax comprises low number-average molecular weight (as 600-6000) polyethylene; Pertroleum wax is as paraffin and microwax; Atactic polypropylene; By carbon monoxide and hydrogen polymerization and synthetic wax, Fischer-Tropsch wax for example; And polyolefin-wax.

Multiple coloring agent and filler are known in the art and can be used as additive and be comprised in the compositions that forms elastic component 12.Coloring agent can comprise dyestuff and pigment, as titanium dioxide.Filler can comprise the material such as Talcum and clay.Other additive can comprise dyestuff, UV absorbent, odor control agent, spice, filler, desiccant etc.

In certain embodiments of the invention, find unexpectedly that elastic component shows significantly big surrender and falls.Those skilled in the art will know, under characteristic strain rate and drawing process temperature, show the elastic component that falls of surrender and can during drawing process, have stability problem, therefore generally obtain having the slow recovery stretch laminate of unreliable performance for the end user.In addition, those skilled in the art will know that also observed stability problem not necessarily falls owing to elastic component shows surrender during drawing process.That other reason can include but not limited to form is local inhomogeneous, the change of structure or basic weight, draw resonance, drawing process (include but not limited to stretch or the change of charging rate, the temperature change of heating element heater), elastic component pair roller or the slip of other processing contact point or the wearing and tearing of adhesion and guide.

Find, show as causing in stretch zones enough strain characteristics uniformly and therefore cause the reliable slow recovery stretch laminate for the end user by the elastic component of measured following one or more characteristics of technology extension test: (i) about 0.3MPa or littler yield stress are fallen under the characteristic strain rate of drawing process and characteristic temperature, (ii) under the characteristic strain rate of drawing process and characteristic temperature about 30% or littler percentage ratio yield stress fall, (iii) fall at about 0.15MPa under the incipient extension strain rate of the characteristic strain rate that equals drawing process and under the characteristic temperature of drawing process or littler yield stress, or (iv) under the incipient extension strain rate of the characteristic strain rate that equals drawing process with the characteristic temperature of drawing process under about 20% or littler percentage ratio yield stress fall.

In addition, the expectation elastic component shows following one or more characteristics: (i) about 0.25MPa or littler yield stress are fallen under the characteristic strain rate of drawing process and characteristic temperature, (ii) under the characteristic strain rate of drawing process and characteristic temperature about 25% or littler percentage ratio yield stress fall, (iii) fall at about 0.10MPa under the incipient extension strain rate of the characteristic strain rate that equals drawing process and under the characteristic temperature of drawing process or littler yield stress, and (iv) under the incipient extension strain rate of the characteristic strain rate that equals drawing process with the characteristic temperature of drawing process under about 10% or littler percentage ratio yield stress fall.

In addition, the expectation elastic component shows following one or more characteristics: (i) about 0.15MPa or littler yield stress are fallen under the characteristic strain rate of drawing process and characteristic temperature, (ii) under the characteristic strain rate of drawing process and characteristic temperature about 20% or littler percentage ratio yield stress fall, (iii) fall at about 0.05MPa under the incipient extension strain rate of the characteristic strain rate that equals drawing process and under the characteristic temperature of drawing process or littler yield stress, perhaps (iv) under the incipient extension strain rate of the characteristic strain rate that equals drawing process with the characteristic temperature of drawing process under about 5% or littler percentage ratio yield stress fall.

The surrender that can utilize some kinds of methods to reduce or eliminate given elastic component is fallen.These include but not limited to one of following pretreatment or their combination: (1) is before stretching step and sometimes also at stretching step heating elastic component, wherein said heating can be by conduction, convection current, radiation, microwave, radio wave, or other heating means known in the art realize, (2) has or do not have prestretched elastic component under the situation of adding heat, perhaps (3) have or do not have under the situation of adding heat, increase progressively the tensile elasticity member in series of steps, described step stretches with the level of stretch that increases gradually and lax subsequently in certain embodiments elastic component.When the heating elastic component, expectation is heated to about 100 ℃ with it by about 30 ℃, and about 35 ℃ to about 70 ℃, perhaps about 40 ℃ to about 60 ℃.Those skilled in the art will know the combination of ad hoc approach or method, and elastic component is heated, prestretched or increase progressively composition and basic weight and the specific stretch laminate manufacture method that tensile degree depends on elastic component.

In the prestretched elastic component fell with the surrender that reduces or eliminate elastic component, expectation prestretched elastic component exceeded the yield strain of measuring at least under characteristic strain rate and drawing process temperature.In addition, expectation prestretched elastic component surpass at least that this elastic component will experience in drawing process in line strain.In addition, expectation prestretched elastic component to engineering stress wherein greater than the strain of yield stress.If the prestretched strain, is then expected the prestretched strain greater than breaking strain and is starkly lower than average breaking strain with the minimum fracture in guaranteeing to produce.And, if elastic component by prestretched surpass in the manufacturing process in line strain, then expect to have time enough and allow that elastic component returns to the strained strain of the technology that is equal to or less than the slow recovery stretch laminate first being processed.The heating elastic component can reduce elastic component and recover the required time.In addition, may need the adjusting process strain to realize required online production strain.In addition, if the characteristic strain rate of prestretched is too high, then can cause being similar to above for described those the stability problem of drawing process.Expectation utilizes alap strain rate so that minimize this type of stability problem.The prestretched step can be carried out in any period between elastic component production and the slow recovery stretch laminate manufacturing usually.

Stretch at the increment that utilizes elastic component and to fall with the surrender that reduces or eliminate elastic component, being desirably in several stages carries out stretched operation.For example, by making elastic component pass through a series of roller, the first pair roller tensile elasticity member wherein, second pair roller makes elastic component lax, the 3rd pair roller tensile elasticity member is extremely than first pair of bigger degree, the 4th pair roller makes elastic component lax, and the rest may be inferred by a series of stretching-relax rolls combination.Utilization have increase progressively level of stretch many pair rollers can to elastic component apply than have with a plurality of rollers in last strain rate lower to the situation of draw roll to the list of suitable level of stretch.In addition, elastic component its in succession draw roll between by follow-up roller to a certain degree stress redistribution takes place at this elastic component through out of date provisional lax making in to elastic component before being stretched to more.Minimize strain rate and allow that stress to a certain degree redistributes the probability that reduces the stability problem that occurs during the drawing process.

In addition, in utilizing the increment stretching, expect that first pair of draw roll tensile elasticity member surpasses the yield strain of measuring at least under characteristic strain rate and drawing process temperature.In addition, if the level of stretch in the in the end a pair of draw roll greater than in the manufacturing process in line strain, then expectation makes to return in the in the end a pair of relax rolls of elastic component and is equal to or less than slow recovery stretch laminate in the strained strain of the technology of first being processed.Thereby the heating elastic component can reduce elastic component to be recovered the required time and allows higher manufacturing linear velocity.In addition, may need the adjusting process strain to realize required online production strain.

In addition, for give the strained tensile any a pair of draw roll to a certain degree that is lower than corresponding to minimum stress after the surrender of measuring under characteristic strain rate and the drawing process temperature to elastic component, if the characteristic strain rate is too high, then it can cause being similar to above for described those the stability problem of drawing process.Expectation utilizes alap strain rate so that minimize this type of stability problem.The increment drawing process can carry out in any period between elastic component production and the slow recovery stretch laminate manufacturing usually.

In addition, utilizing during increment stretches expectation minimization or prevent elastic component lax between one or more stretching step for certain embodiments of the present invention.For example, be desirably in succession roller between only have cumulative degree stretching.The probability of stability problem can be expected to occur during this method minimizes strain rate and reduces drawing process, when comprising relaxation step, higher elastic tensile modulus may be caused simultaneously.Higher modulus can cause for example easier fleece processing of slow recovery stretch laminate production period elastic component.

With regard to certain embodiments of the present invention, be desirably in after the production, wait at least about 12 hours (especially comprising 24 hours) before the beginning pretreating process.Not bound by theory, it is believed that for some embodiment, fully develop for the structure that is used for elastic component with time enough.Various analysis can be used for determining preferably how long waited for before the beginning pretreating process after concrete elastic component production.For example, recover after can utilizing the elongation of the monitoring of disclosed method in the U.S. Patent application 11/114,508 elastic component.

Available suitable substrates 14 comprises non-woven webs, woven fleece, knit goods, thin film, film laminate, perforated film, nonwoven laminates, sponge, foam, scrim and their any combination.Suitable substrate can comprise natural material, synthetic material or their any combination.In order to be used for absorbent article and to be particularly useful for products such as diaper, substrate 14 is generally submissive, soft feel and non-stimulated to wearer's skin.In certain embodiments, substrate 14 can comprise non-woven webs such as spun-bonded fibre net, meltblown fiber web, carding fiber net and their combination (for example, spunbond-melt and spray complex and variant).

The size of substrate 14 generally only is subjected to slowly to recover the restriction of the essential final use of elastic laminate material 10.

Slow recovery stretch laminate 10 of the present invention shows unique elasticity and recovery characteristics.When measuring when lagging behind by two circulations, slow recovery stretch laminate 10 shows the normalization off-load power greater than about 0.16N/ (g/m) under 37 ℃.Normalization off-load power less than about 0.12N/ (g/m) under 37 ℃ it is believed that the elastomer that is not enough to as in the absorbent article.The laminated material that has under 37 ℃ less than the normalization off-load power of 0.12N/ (g/m) can not keep the warm skin that closely contacts the wearer of absorbent article.In certain embodiments, slow recovery stretch laminate 10 shows the normalization off-load power greater than about 0.24N/ (g/m) under 37 ℃.

Conventional stretch laminate (that is, for example generally be present in comprising those of diaper in the absorbent article) 22 ℃ show minimum elongation after recovering for 15 seconds down after strain.Qualitatively, Chang Gui stretch laminate shows " retraction fast " (that is, being discharged the very fast retraction in back by extended state).As a comparison, as extending the back, to recover test measured, and slow recovery stretch laminate 10 of the present invention shows about 10% or bigger initial strain percentage ratio after recovering for 15 seconds down at 22 ℃.In other embodiments, slow recovery stretch laminate 10 shows about 20% or bigger initial strain percentage ratio after down recovering for 15 seconds at 22 ℃.In other suitable embodiment, slow recovery stretch laminate 10 shows about 30% or bigger initial strain percentage ratio after down recovering for 15 seconds at 22 ℃.In other suitable embodiment, slow recovery stretch laminate 10 shows about 40% or bigger initial strain percentage ratio after down recovering for 15 seconds at 22 ℃.

In addition, slow recovery stretch laminate 10 of the present invention shows specified initial strain percentage ratio after recovering 30 seconds, 60 seconds or three minutes under 22 ℃.In certain embodiments, slow recovery stretch laminate 10 shows about 10% or bigger initial strain percentage ratio after down recovering for 30 seconds at 22 ℃.Alternatively, slow recovery stretch laminate 10 shows about 15% or bigger initial strain percentage ratio after down recovering for 30 seconds at 22 ℃.In other embodiments, slow recovery stretch laminate 10 shows about 10% or bigger initial strain percentage ratio after down recovering for 60 seconds at 22 ℃.

Slow recovery stretch laminate 10 shows temperature-responsive.In certain embodiments, slow recovery stretch laminate 10 at the initial strain percentage ratio that shows after the recovery time at specified amount under 32 ℃ less than the initial strain percentage ratio that after identical recovery time, is showing under 22 ℃.In one embodiment, temperature-responsive slow recovery stretch laminate 10 shows the minimizing (that is, [22 ℃ of initial strain percentage ratio that recovers down after 15 seconds]-[32 ℃ of initial strain percentage ratio that recovers down after 15 seconds]) with the initial strain percentage ratio of comparing at the initial strain percentage ratio that shows after 22 ℃ of following 15 seconds after 32 ℃ of following 15 seconds.In some embodiments, this difference is equal to or greater than 5%.In other embodiments, slow recovery stretch laminate 10 show be equal to or greater than 10%, 20%, 30% or alternatively 40% with 32 ℃ of following 15 seconds after the difference of initial strain percentage ratio after 22 ℃ of following 15 seconds comparing.It is believed that the slow recovery stretch laminate 10 that shows temperature-responsive also can help diaper and wear.When diaper when wearing under about room temperature (that is, about 22 ℃), slow recovery stretch laminate 10 shows the higher initial strain percentage ratio that continues the fixed time section, it allows that nursing staff or wearer wear diaper.When wearing diaper, the temperature of slow recovery stretch laminate 10 will raise owing to its skin that closely contacts the wearer.Along with the temperature of slow recovery stretch laminate 10 increases and near skin temperature (that is, about 32 ℃), initial strain percentage ratio reduces.Temperature-responsive allows that diaper wears under the situation of not having " retraction fast ", provide the back that wears of increase to recover simultaneously.

Slow recovery stretch laminate 10 can utilize in various consumer goods or commercial product.Yet slow recovery stretch laminate 10 especially has special beneficial effect in the disposable absorbent article such as diaper etc. at absorbent article.Slow recovery stretch laminate 10 can be used in the multiple zone or is used for the various products element to provide elastic characteristic to absorbent article.Can expect slow recovery stretch laminate 10 of the present invention is incorporated among U.S. Patent Publication 2005-0273071,2005-0171499,2007-0191806,2004-0162538 and the 2005-0095942 in the disclosed absorbent article.

Another embodiment of the invention relates to any method that wears in the above disclosed absorbent article.Absorbent article can offer the nursing staff and be used to wear on one's body the wearer.Absorbent article can be compact condition, makes to comprise that the stretch laminate of slow recovery stretch laminate is in lax, unstrained substantially state.Nursing staff's absorbent article that can stretch, thus launch and strain described stretch laminate.Goods generally are stretched and wear with preparation.Absorbent article can be kept the elongated state of functionalization and reach effective a period of time.In one embodiment, goods can wear these goods the wearer the nursing staff and keep elongated state in the necessary enough time on one's body.When diaper discharges after stretching, this diaper usually its can successfully wear the wearer on one's body before retraction and/or folding.In one embodiment, slow recovery stretch laminate shows the initial strain percentage ratio more than or equal to 10% after recovering for 15 seconds under 22 ℃.After the application, goods can continue retraction so that warm ideal stickiness is provided.Can repeat this method when goods are besmirched during wearing.

In another embodiment, a plurality of absorbent article as disclosed above can be packaged in the external member.In general, external member makes a certain amount of absorbent article be delivered to consumer and is bought by consumer, saves the space simultaneously and simplifies transportation and storage.External member can need to activate, and making that goods become can be near (for example, the removal of the unlatching of capping, panel etc.).In one embodiment, the countless absorbent articles that external member is bundled in together are defined as entity, and cover with thermoplastic film overwrap, and are as United States Patent (USP) 5,934, disclosed in 470.The thermoplastic film covering can comprise turned parts and remove portion of hot plastic films covering and use goods to allow.General turned parts can comprise successive substantially weak line, is preferably the perforation in the thermoplastic film covering.Exemplary turned parts is present in U.S. Patent application 5,036, in 978.

Although more than described an external member embodiment, other modification of external member also can clearly be predicted.Overwrap can comprise multiple material, includes but not limited to thermoplastic film, non-woven material, weaving material, paper tinsel, fabric, paper, cardboard, elastomeric element, rope, belt and their combination.Overwrap can be wholly or in part in conjunction with and/or cover a plurality of absorbent articles.Other especially preferred packing and packing method are disclosed in U.S. Patent Publication 5,050, in 742 and 5,054,619.In addition, external member can comprise a plurality of overwrap.For example, a plurality of absorbent articles of the present invention can wrap up with thermoplastic film overwrap, and the pull-on garment of many film wrapped is by outer wrapping in carton or in second thermoplastic film overwrap then.In addition, external member can not contain special turned parts.For example, there is not the thermoplastic film overwrap of perforation only to be unlocked by Tear Film.

Method of testing

Recover the elongation back

This method is used to measure as strain after the elongation of the stretch laminate of the function of temperature and time.Measurement is carried out when 22 ℃ (72 °F) or when 32 ℃ (90 °F).Measurement when 22 ℃ (72) is designed to simulate stretch laminate recovery at room temperature, and the measurement when 32 ℃ (90) is designed to measure stretch laminate near the recovery under the skin temperature.Sample is carried out two-step analysis, stretch and recovery.This method adopts the dynamic mechanical analysis instrument.This paper utilization derives from TA Instruments, Inc., New Castle, the TA Instruments DMA 2980 of Delaware (below be called " DMA 2980 "), Universal Analysis 2000 softwares that it is furnished with pellicle fixture, is used for the Thermal Advantage/Thermal Solutions software of data acquisition and is used for data analysis.The DMA device that has many other types, and the technical staff by polymer and copolymer representational field that uses of dynamic mechanical analysis is known.

Operation, demarcation and guidance use the method for DMA 2980 to be present in the Thermal Advantage user reference guide of TAInstruments DMA 2980 operator's manuals of in March, 2002 distribution, in July, 2000 distribution and Universal Analysis 2000 guides of issuing in February, 2003.For the technical staff who uses DMA 2980, below the operation service condition should be enough to the stretching and the recovery of repeated sample.

DMA 2980 is configured to and can operates having under the control force pattern of pellicle fixture.Pellicle fixture is installed on the DMA 2980, and calibrates according to user's reference guide.Stretch laminate to be measured is cut into the sample of uniform-dimension substantially.For DMA 2980, suitable sample-size is about 20mm * 6.4mm * 1.0mm (a length x width x thickness).Sample thickness depends on the material and the structure of stretch laminate and depends on measures the used confined pressure of thickness.TA Instruments suggestion sample thickness when being installed in the pellicle fixture safely should be less than or equal to about 2.0mm.Adjust the following pellicle fixture among the DMA 2980 and be locked in the appropriate location, it provides about 10mm between clamping surface.Sample is installed in the pellicle fixture, and makes the gauge length that moves on the lower clamp with between the mensuration pellicle fixture.The sample that should be appreciated that reference in this method must move down into a kind of in the lower clamp by last anchor clamps for slow recovery stretch laminate wherein.Record sample ID and size.Pellicle fixture is locked in the appropriate location and closes stove.

Drawing process-with regard to above specified sample-size, DMA 2980 is set as follows: be applied to the preload force on the sample (0.01N) in the anchor clamps; Auto zero displacement (opening) when the test beginning; Stove (pass), chucking position (locking), temperature remains on T when drawing process finishes _i(22 ℃ or 32 ℃).Data acquisition rate is set at 0.5Hz (1 point in per 2 seconds).Stretching run is loaded among the DMA 2980.This method is (1) initial temperature T step by step _i(22 ℃ or 32 ℃), (2) are at T _iFollowing balance, (3) data storage are opened (ON) and (4) increases power to 18.0N with 5.0N/min.

During the test beginning, temperature rises to specified T _i(22 ℃ or 32 ℃) [method step 1], and make temperature remain on this T _i[method step 2] down.At T _iAfter minimum 15 minutes, the operator begins the sample stretching and carries out data acquisition [method step 3 and 4] simultaneously down.The cumulative power (for example, for above specified sample-size, the cumulative power that applies is 5N/ minute) that applies with every millimeter initial specimen width 0.8N/min is stretched to the about 30mm of length with sample.Power increase more approaching simulation goods gradually wear and prevent the sample breakage.The tensile elongation of sample with about 30mm is locked in the appropriate location and remains on T _iLaminated material is stretched to the required power of the length of about 30mm and in the percent strain of this length laminated material by the digitizer hand-kept on the instrument.By deducting tensile elongation with gauge length, then with this result divided by gauge length and multiply by 100 and calculate percent strain.With following formula the initial percentage strain is described:

Initial percentage strain=% strain _I=100* ((Ls-L _g)/L _g)

L wherein _gBe the length of stretch laminate under relaxed state of pinching, Ls for the length that is in the stretch laminate between the pellicle fixture in the stretching step of analyzing at last (～30mm).The % strain _iPercent strain for (after the stretching step of this method is finished) stretch laminate when restoration methods begins.The sample that is stretched to 30mm length by the gauge length of 10mm causes 200% percent strain.

Stretch laminate may not show 200% strained ductility and not cause irreversible distortion, layering, tears or significantly be out of shape percentage ratio (that is, greater than about 10% distortion).Especially true for the stretch laminate that lateral plate, lower limb hoop and belt by commercially available prod such as diaper obtain.For example, when apply less power (＜4N) time, stretch laminate (～6.4mm is wide) can be stretched to 100% strain or 150% strain easily.Yet, if the power that applies continues to increase to and reaches 200% strain, then the percent strain of stretch laminate reaches stable and further may become difficulty and/or may cause the irreversible distortion of stretch laminate, layering, tear or significantly be out of shape percentage ratio (that is, greater than 5% distortion) of extension.For this test, select maximum percent strain (for example 200%, 150% or 100%), make this strain can not cause the irreversible distortion of stretch laminate, layering, tear or significantly be out of shape percentage ratio (that is, greater than 5% distortion).If stretch laminate has the ductility less than 200% strain (± 5%), then a new sample example is stretched to the development length of 30mm from the gauge length of 12mm, it causes 150% percent strain.If stretch laminate has the ductility less than 150% strain (± 5%), then a new sample example is stretched to the development length of 30mm from the gauge length of 15mm, it causes 100% strained percent strain.Have＜test of the stretch laminate of 100% maximum ductility also belongs to the scope of this method.With regard to the laminated material with maximum ductility of 50% to 94%, elongation back strain is reported as percent strain under different recovery times (15 seconds, 30 seconds, 60 seconds and 3 minutes) but not initial strain percentage ratio (%).

With regard to the sample of different size, adjust the apply power of stretching sample applied force to realize increasing with every millimeter initial specimen width 0.8N/min.For example, will be applied on the sample with 3.2mm original width with the power that 2.5N/min increases.With regard to the sample of different length, adjust between elongating stage total displacement with realize 200% initial percentage strain (if perhaps sample have limited ductility can be littler, i.e. 150% or 100% strain).

Restoration methods-be loaded into restoration methods on the instrument and in drawing process, reach required initial percentage strain (promptly 200%, 150% or 100%) after begin about 15 seconds.Four steps of restoration methods are opened (ON) for (1) data storage, and (2) apply the power of 0.01N, and (3) are warming up to T _i, (4) isothermal 3.0 minutes.The setting of following DMA2980 parameter is changed by drawing process: (pass) changed in the automatic zero point displacement.At specified temperature (T _i=22 ℃ or 32 ℃) down above the length of measuring sample after 3 minutes time period with restoration methods.Sample length, percent strain and probe temperature are noted as the function of recovery time.Elongation back strain is recorded as the strained percent of back initial percentage different recovery time (15 seconds, 30 seconds, 60 seconds and 3 minutes).

With regard to the sample of different size, the adjustment recovery is applied to the apply power (6.4mm width sample 0.01N) of power to realize every millimeter initial specimen width 0.0016N on the sample during (above the 2nd step).For example, the power with 0.005N is applied on the sample of 3.2mm width.

Two circulations lag behind and test

This method is used for determining: the performance that during the wearing of the product that comprises slow recovery stretch laminate, can be associated with the power that consumer is subjected to, in case and its worn product and how to fit and show.

Two circulation hysteresis method of testings in room temperature (21 ℃/70) down and also carry out under body temperature (37 ℃/99).Stretch laminate to be measured is cut into the sample of basic straight-line dimension.Select sample-size so that realize required strain with the power that is suitable for device.The appropriate device that is used for this test comprises can be from MTSSystems Corp. (Eden Prairie, Minn.) commercially available tensile tester (for example, AllianceRT/1 or Sintech 1/S) maybe can be from Instron Engineering Corp. (Canton, Mass.) commercially available tensile tester.For above Alliance RT/1 that enumerates or Sintech 1/S device, suitable sample-size takes advantage of about 100mm long for about 25mm is wide.Sample thickness depends on the material and the structure of stretch laminate and depends on the confined pressure that is used to measure thickness.It is thick that the sample thickness of measuring with 0.2 pound/square inch confined pressure is generally 0.5mm to 5mm.Yet, have different-thickness (for example,＜0.5mm or＞test of 5mm) stretch laminate is also in the scope of this method.

Following steps show the measurement when using above sample-size and Alliance RT/1 or Sintech 1/S.Device and computer interface.TestWorks 4 ^TMThe software control test parameter carries out data acquisition and calculating, and figure and data record are provided.

The chuck width that is used to test is more than or equal to specimen width.Usually " (2.54cm) the wide chuck that uses 1.This chuck is used for along the air-actuated jaw of concentrating whole chucking power perpendicular to the single line of test stress direction for design, and it has a flat surfaces and one and extends a semicircle by it (opposite face of radius=6mm) is to minimize the slip of sample.Under 37 ℃ of measurement situations, upper grip is the lightweight chuck with serrated face.

Select load cell with the toilet dynamometry will load cell ability or used load range 10% and 90% between.Usually use the load cell of 25N.Sectional fixture and chuck.Explanation calibration instrument according to the manufacturer.Distance between the line of chucking power (gauge length) is 2.50, and " (63.5mm), it is measured with the steel ruler that places the chuck next door.Load reading on the instrument is made zero with the quality of deduction anchor clamps and chuck.Before the test with sample minimum 1 hour of 21 ℃ of following balances.With standard be installed in a certain way in the anchor clamps make not lax and the load of surveying between 0.00N and 0.02N.The sample that should be appreciated that reference in this method for slow recovery stretch laminate wherein must along whole gauge lengths extend a kind of.Device is positioned over is used for the measurement under 21 ℃, carried out in the temperature controlled compartment.Adopt the probe temperature of suitable environmental chamber to be kept under 37 ℃, measuring; Sample is installed in the chuck and before beginning test 37 ℃ of following balances 5 minutes.The purpose that should test is selected specified initial percentage strain (strain _i(for example, 150%, 100% or 70%) makes described strain can not cause the irreversible distortion of stretch laminate, layering, tear or significantly be out of shape percentage ratio (that is, greater than about 10% distortion).Have＜test of the stretch laminate of 70% initial ductility is also in the scope of this method, however off-load power will be measured under the strain that equals specified initial percentage strained 75%.For example, if specified initial percentage strain is 60%, then off-load power is measured under 45% strain.

Two circulation hysteresis method of testings relate to following steps:

(1) " the constant chuck speed tension sample of/min (50.8cm/min) is to specified initial percentage strain (that is strain, with 20 _i=150%), do not pause.

(2) " the constant chuck speed of/min (7.62cm/min) is decreased to 0% strain (that is, chuck being returned back to initial gauge length) with strain, does not pause with 3.

(3) " the constant chuck speed tension sample of/min (50.8cm/min) is to strain with 20 _i, do not pause.

(4) " the constant chuck speed of/min (7.62cm/min) is decreased to 60% strain with strain with 3.If strain _i＜70%, then strain is decreased to strain _i75%.

(5) keep sample under 60% strain 5 minutes.If strain _i＜70%, then keep sample in strain _i75% time.

(6) " the constant chuck speed of/min (7.62cm/min) navigates to 0% strain with 3.

The off-load power of report be in step 5 maintenance after 5 minutes measured stretch laminate (SL) in 60% strain (perhaps strain therein _iUnder 70% situation, 75% strain _i) under off-load power, be shown below, it is normalized to the basic weight of elastomer+binding agent (E+A) in the stretch laminate * stretch laminate of the per 1 meter width of newton, N/ (mgsm)=N/ (g/m).The basic weight of elastomer and binding agent calculates divided by the stretch laminate area of stretching out fully by the gram number with elastomer+binding agent in the stretch laminate in the stretch laminate.The area of the stretch laminate of stretching out fully (AFESL) is defined as under not having elastomer and adhesive case the area of substrate in the stretch laminate.Normalization off-load unit of force is

With regard to different sample-size, can adjust chuck speed to keep for the suitable strain rate of each part in the test.For example, " sample gauge length (31.7mm), meeting use 10 in step 1 and the step 3 " chuck speed of/min (25.4cm/min) for 1.25.

The technology extension test

This method is used to measure the engineering stress of elastic component to strain curve.This measurement is carried out under near the chuck speed of the characteristic strain rate of the drawing process paid close attention to and characteristic temperature and temperature.

The first step is to measure corresponding chuck speed, and it depends on specific drawing process.Although there is multiple drawing process to be used for industry, but modal method is to impel elastic component through a series of controlled temperature roller, each all has a superficial velocity faster than previous, for example A.Ziabicki is at Fundamentals of Fibre Formation, John Wiley ﹠amp; Sons, New York (1976) is described in the 6th chapter.For single step (two rollers) drawing process, average technology strain rate

Can and go up by difference roller speed tensile span length estimation takes place, promptly

V wherein _StretchFor acting on the draw speed on the elastic component, V _ChargingBe the charging rate of the elastic component that enters into drawing process, and L _SpanThe span length that is stretched thereon for elastic component.Person of skill in the art will appreciate that span length can be shorter than the path distance between feeding roller and the carry-over pinch rolls.Roller speed and engineering processing strain γ _TechnologyBetween relation provide by following formula:

γ wherein _TechnologyBe units of percent.

Those skilled in the art also will recognize, in the multi-step tension method, for example in having the drawing process of 3 or more a plurality of draw rolls that contain or do not contain draw pin, between every pair roller, can have different average strain rates, but can be for the average strain rate and the technology strain of each stretch zones by the formulate that is equal to formula [1] and formula [2].In addition, those skilled in the art also will recognize, in alternately parallel zone that is stretched therein and the alternative drawing process that keeps almost not tensile regional coexistence, average strain rate and technology strain for each stretch zones can be by the formulates that is equal to formula [1] and formula [2], described drawing process is such as but not limited to even drawing process or increment drawing process, described even drawing process such as tentering, as J.H.Briston at Plastic Films, the 2nd edition, Longman Inc., New York (1983) is described in the 83rd to 85 page, described increment drawing process such as ring-rolling, as U.S. Patent Publication 4,116,842 and 5, disclosed in 296,184.In in these situations each, importantly recognize the average strain rate paid close attention to and technology strain will for elastic component wherein by the yield point place.

Has constant chuck speed C _HGeneral extension test in, with elastic component by its initial (gauge length) length Be stretched to any given tensile elongation L _oThe average tensile strain rate L mode that can be similar to formula [1] estimate, that is:

With regard to L near L _o(L → L _o), i.e. the situation of incipient extension strain rate is to utilize following formula more easily:

Tensile elongation and engineering elongation strain γ _StretchBetween relation provide by following formula:

γ wherein _StretchBe units of percent.

With regard to the extension test of near-online drawing process, two kinds of situations are determined:

Situation 1: the average strain rate in the extension test (elongation strain is equal to the technology strain at most) equals average technology strain rate.In this case, γ _Stretch=γ _Technology, this equation and formula [1] to [3] and [5] combination are obtained

Perhaps be equal to

Situation 2: the initial strain rate in the extension test equals average technology strain rate.Formula [1], [2] and [4] combination are obtained

Perhaps be equal to

Utilize the chuck speed of regulation, extension test carries out under the characteristic temperature of the drawing process of being paid close attention to.Material to be tested is cut into basic rectilinear form.Select sample-size so that realize required strain with the power that is suitable for device.The appropriate device that is used for this test comprises can be from MTS Systems Corp. (Eden Prairie, Minn.) commercially available tensile tester (for example, Alliance RT/1 or Sintech1/S) maybe can be from Instron Engineering Corp. (Canton, Mass) commercially available tensile tester.For above-listed or Alliance RT/1 or Sintech 1/S instrument, to be that thick, the about 20mm of about 0.15mm is wide take advantage of about 100mm long to suitable sample-size.

Following steps are for example understood the measurement when using above sample-size and Alliance RT/1 or Sintech1/S.Device and computer interface.TestWorks 4 ^TMThe software control test parameter carries out data acquisition and calculating, and figure and data record are provided.

Test used chuck and be wider than elastic component.Usually use 1.00 inches chucks that (2.54cm) is wide.This chuck is that be designed to can be with whole chucking power along the pneumatic chuck of concentrating perpendicular to the single line of test stress direction, and described chuck has a flat surfaces, and (opposite face of radius=6mm) is in order to minimize the slippage of sample with protruding into semicircle.Select load cell make institute's dynamometry will load cell ability or used load range 10% and 90% between.Usually use the load cell of 100N.Sectional fixture and chuck.Explanation calibration instrument according to the manufacturer.To be set at 1,000 as the liter step acceleration of motor control parameter to guarantee before yield point, realizing specified chuck speed.Distance between the line of chucking power (gauge length) is 1.00 inches (25.4mm), and it is measured with the steel ruler that places the chuck next door.Load reading on the instrument is made zero with the quality of deduction anchor clamps and chuck.Before test, measure the quality and the thickness of sample.So that do not have lax and the mode of the load of surveying between 0.00N and 0.05N sample is installed in the chuck.For the measurement of under high temperature (for example, 40 ℃), carrying out, sample before beginning test under probe temperature about 5 minutes of balance.Use suitable environmental chamber to remain on 40 ℃ with the temperature that will be used to measure.Device is positioned over is used for the measurement under 22 ℃, carried out in the temperature controlled compartment.Minimum five samples are used for determining the average test value.

For showing the material that surrender is fallen, as shown in Figure 2, yield point 100 identifies yield stress 101, yield stress 102, surrender back minimum stress 103 and yield stress and falls 104.For not showing the material that surrender is fallen, as shown in Figure 3, utilize I.M.Ward at MechanicalProperties of Solid Polymers, Wiley-Interscience, New York (1971), the method for the 278th page of outline is estimated yield point 110.That is, yield point occurs in the wherein initial part 111 of load-deformation curve and two tangent line intersections of second portion 112.In addition, for not showing the material that surrender is fallen, yield stress reduces to zero.

Two circulations are fitted and are tested

This method be used for determining during the wearing of the product that comprises slow recovery stretch laminate, can being associated with the power that consumer is subjected to and also can with wear in product how to fit and show relevant slow recovery stretch laminate performance.

Two circulation applying method of testings in room temperature (22 ℃/72) down and also carry out under body temperature (37 ℃/99).Slow recovery stretch laminate to be measured is cut into the sample of basic straight-line dimension.Select sample-size so that realize required strain with the power that is suitable for device.In addition, can select sample-size based on product description and laminating method.The appropriate device that is used for this test comprises can be from MTS Systems Corp. (Eden Prairie, Minn.) commercially available tensile tester (for example, Alliance RT/1 or Sintech1/S) maybe can be from Instron Engineering Corp. (Canton, Mass.) commercially available tensile tester.For above Alliance RT/1 that enumerates or Sintech 1/S device, to be that about 210mm is wide take advantage of about 451mm long to suitable sample-size.Sample thickness depends on the material and the structure of slow recovery stretch laminate and depends on the confined pressure that is used to measure thickness.It is thick that the sample thickness of measuring with the confined pressure of 0.2 pound/in2 is generally 0.5mm to 5mm.Yet, have different-thickness (for example,＜0.5mm or＞test of 5mm) slow recovery stretch laminate is also in the scope of this method.In addition, has the slow recovery stretch laminate of different in width or length also in the scope of this method.

Usually, as shown in Figure 4, with a pair of be of a size of about 2 " (5.08cm) wide take advantage of 1 " (2.54cm) chuck 150 on high smooth styrene-butadiene surface unite use with sample clamping device 153.Test the width of the width of used sample clamping device 153 more than or equal to slow recovery stretch laminate sample 151.Chuck 156 is pneumatic chuck and is designed to whole chucking power is concentrated between two smooth styrene-butadiene faced surfaces to minimize the slip of sample clamping device 153.Sample clamping device 153 is made by two collinear LEXAN sheets, and described LEXAN sheet has about 50mm height and takes advantage of the wide thick size of about 1.5mm of taking advantage of of about 210mm.Each sheet in the sample clamping device 153 has three wide hook material bands 152 (for example, used in the diaper fastener) of about 10mm height * 210mm on the face that is connected respectively to top, middle part and bottom.Hook material band 152 is used for slow recovery stretch laminate sample 151 is fixed on sample clamping device 153 and minimizes the slip of slow recovery stretch laminate sample 151 in sample clamping device 153.

Preparing the slow recovery stretch laminate test sample book by successive laminating method utilizes following steps to carry out.Sample is taken from whole laminated material production.In this example, prepare the continuous slow recovery stretch laminate with the longitudinal length that is equal to 100 slow recovery stretch laminates with the laminated material production in 1 minute that per minute 100 units carry out, wherein " unit " is the product length of 451mm.Stretching is extended (no vision pinching and nothing are excessively extended) from the continuous slow recovery stretch laminate sample of slow recovery stretch laminate production fully until this slow recovery stretch laminate.Along perpendicular to longitudinally laterally at the non-woven material of the length place of 451mm labelling slow recovery stretch laminate, wherein said vertically be vertical in the lamination process.In addition, labelling non-woven material 50mm on each side of 451mm labelling., so that being provided, 2 groups of n=10 are used for testing down with the long slow recovery stretch laminate unit of per 1/10th unit cutting 451mm and sample 2 laminated materials in room temperature (22 ℃) and body temperature (37 ℃).Each slow recovery stretch laminate sample is that about 451mm is long when extending fully, and by two ends labelling 50mm, therefore the distance between " 50mm " mark line is about 351mm.After the cutting, the slow recovery stretch laminate sample adapted to minimum 24 hours down in 22 ℃ before test.

In addition, referring to Fig. 4, slow recovery stretch laminate sample 151 is placed sample clamping device 153, keep slow recovery stretch laminate sample 151 smooth (not having pinching in the non-woven material between sample clamping device 153), and have with each ends of the inward flange 154 straight slow recovery stretch laminate samples 151 of sample clamping device 153 at a distance of the mark line of " 50mm " and have and the end of sample clamping device 153 at the outward flange 157 straight slow recovery stretch laminate samples 151 of all four corners.Sample clamping device 153 is placed chuck face 150, so that the inward flange 154 of inward flange of sample clamping device 153 158 and chuck face 150 is in line.The inward flange 154 of top and bottom chuck face 150 is separated the distance 155 of about 61mm.When the sample clamping device 153 that comprises slow recovery stretch laminate sample 151 places between the chuck face 150, between slow recovery stretch laminate sample 151, exist lax.For example, the slow recovery stretch laminate sample 151 of pinching has the length of 351mm when extending fully in the gauge length of 61mm.At two circulation applying test periods, slow recovery stretch laminate sample 151 is stretched to the extension gauge length of 305mm, the slow recovery stretch laminate sample 151 that it extends fully corresponding to about 87% between the inward flange 154 of chuck face 150.

Select load cell make institute's dynamometry will load cell ability or used load range 10% and 90% between.Usually use the load cell of 25N.Sectional fixture, chuck 156, chuck face 150 and sample clamping device 153.Explanation calibration instrument according to the manufacturer.Distance between the line of chucking power (gauge length) 155 is 2.4, and " (61mm), it is measured with the steel ruler that places chuck face 150 next doors.

Before the test with the slow recovery stretch laminate sample minimum 24 hours of 22 ℃ of following balances.The sample clamping device 153 that will comprise slow recovery stretch laminate sample 151 is installed between the chuck face 150 in a certain way, makes to have aforesaid relaxing.Device is positioned over is used for the measurement under 22 ℃, carried out in the temperature controlled compartment.Adopt the probe temperature of suitable environmental chamber to be kept under 37 ℃, measuring; Slow recovery stretch laminate sample 151 installed as mentioned above and before beginning test about 5 minutes of 37 ℃ of following balances.

Two circulation applying method of testings relate to following steps, and wherein constant chuck speed is 20 "/minute (50.8cm/min):

(1) the load reading that will install before beginning to test make zero (0.00N).

(2) tension slow recovery stretch laminate sample 151 does not pause to specified laminated material applying strain (400%); That is, 400% laminated material applying strain is corresponding to being extended by 2.4 " (61mm) to 12 " gauge length (305mm).

(3) the laminated material applying strain of reduction chuck to 0% pauses; That is " the initial gauge length (61mm) that, returns back to 2.40.

(4) tension slow recovery stretch laminate sample 151 does not pause to specified laminated material applying strain (400%).

(5) the laminated material applying strain of reduction chuck to 300%; That is " gauge length (243.8mm), to 9.6.

(6) slow recovery stretch laminate sample 151 is kept 2 minutes (the not load laminated material applying strain of circulation 2,300%) under 300% laminated material applying strain.

(7) the laminated material applying strain of reduction chuck to 200%; That is " gauge length (182.9mm), to 7.2.

(8) slow recovery stretch laminate sample 151 is kept 2 minutes (the not load laminated material applying strain of circulation 2,200%) under 200% laminated material applying strain.

(9) the laminated material applying strain of reduction chuck to 150%; That is " gauge length (152.4mm), to 6.0.

(10) slow recovery stretch laminate sample 151 is kept 2 minutes (the not load laminated material applying strain of circulation 2,150%) under 150% laminated material applying strain.

(11) the laminated material applying strain of reduction chuck to 100%; That is " gauge length (121.9mm), to 4.8.

(12) slow recovery stretch laminate sample 151 is kept 2 minutes (the not load laminated material applying strain of circulation 2,100%) under 100% laminated material applying strain.

(13) the laminated material applying strain of reduction chuck to 0%; That is " the initial strain (61mm) that, returns back to 2.40.

The maximum off-load power of the second circulation off-load power (unit is newton (N)) of the slow recovery stretch laminate of report for during keeping in per two minutes, under 300% laminated material applying strain, 200% laminated material applying strain, 150% laminated material applying strain and 100% laminated material applying strain, measuring.

Slow recovery stretch laminate with different units length is in the scope of this method.Select initial gauge length and the final gauge length (400% laminated material applying strain) of extending, make slow recovery stretch laminate under 400% laminated material applying strain, be extended fully by about 87%.For different sample-size, can adjust chuck speed to keep for the suitable strain rate of each part in the test.For example, 10 " chuck speed and 6 of/min (25.4cm/min) " final extension gauge length (152.5mm) " sample gauge length (30.5mm) that will be used for 1.2.

Embodiment

Preparation-the slow recovery elastic materials of elastomeric material is by about 48.5% elastomer polymer carrier 4211A (Dexco Polymers by weight, Houston, TX) blend preparation, described carrier comprises about by weight 30% styrene, about 48.5% modified resin ArkonP-140 (Arakawa Chemical Inc. by weight, Chicago, IL) and about by weight 3% mineral oil Britol 50T (Crompton Corporation, Petrolia, PA).With component compounding in double screw extruder, pelletizing, and be coated with powder to avoid obstruction.It is main film roll that the pellet of compounding is extruded by the single screw extrusion machine founding, adds powder coating during this period and blocks avoiding, and main film roll is cut into the arrowband of about 21 mm wides and loads in mixture in the chest.The elastomeric material for preparing different basic weights, basis weight range be about 120 to about 160 the gram/square metre.

The laminated material preparation-utilize once step stretching unit as shown in Figure 5 to prepare slow recovery stretch laminate.By having V _ChargingThe warm-up mill 129 of superficial velocity 127 slow recovery elastic materials 128 is drawn in the draw unit, after loading arm 130, begin to stretch, spunbond with the two layers of polypropylene base-as to melt and spray-viscose non-woven material 120 engages, and in elastic bonding unit 122, be attached on the non-woven material 120, described non-woven material have about 22 grams/square metre basic weight and with about 30 grams/square metre the binding agent that adds of content, described binding agent equals the pattern of about 15 to 25 microgrooves at laminated material (Bostik H2401 by application device 121 with per inch, Wauwatosa, that WI) makes laterally uses, described elastic bonding unit is made up of two stainless steel riders of water-cooled, described stainless steel rider is configured to fixed close clearance to obtain enough strong bonding, and is for example measured by the peel strength test described in ASTM F904.The superficial velocity of elastic bonding roller is the technology draw speed of about 45 meters per minutes 123 times, and the total path length between warm-up mill 129 and the elastic bonding unit 122 be about 96.5 inches and etc. the span length of film stretching takes place thereon.

Utilize elastomeric material shown in the table 1 and process conditions to prepare slow recovery stretch laminate.During the elastic stretching step, at room temperature stretched elastic part shows non-homogeneous stretching (embodiment 1 and 3).When the fixedly given viewpoint between warm-up mill and elastic bonding roller was observed elastomeric element, the width of elastomeric element changed in the mode of approximate period property.By contrast, stretched elastic part shows even stretching (embodiment 2 and 4) under about 40 ℃ characteristic technological temperature.

Table 1: slow recovery stretch laminate

Embodiment number (laminated material number)	The elastomeric average basis weight of slow recovery (gram/square metre)	Technology strain (%)	The characteristic technological temperature	Characteristic technology strain rate (per minute)
Embodiment number (laminated material number)		Technology strain (%)	The characteristic technological temperature	Characteristic technology strain rate (per minute)	??1	??123	??419	Room temperature (about 22 ℃)	??14.8
??2	??131	??419	??40℃	??14.8	??1	??123	??419	Room temperature (about 22 ℃)	??14.8
??2	??131	??419	??40℃	??14.8	??3	??134	??350	Room temperature (about 22 ℃)	??14.3
??4	??154	??350	??40℃	??14.3	??3	??134	??350	Room temperature (about 22 ℃)	??14.3

The extension test of the extension test-slow recovery elastic materials of elastomeric material carries out under 22 ℃ and 40 ℃.For the strained material of the technology with about 419%, utilize the chuck speed of about 15 and 62 inches per minutes, and, utilize the chuck speed of about 15 and 50 inches per minutes for the strained material of the technology with about 350%.The chuck speed of 15 inches per minutes is corresponding to the incipient extension strain rate that equals characteristic technology strain rate in the table 1, and the chuck speed of 50 inches per minutes and 62 inches per minutes is corresponding to the average tensile strain rate that equals characteristic technology strain rate in the table 1 (until the technology strain).Average yield stress, surrender back minimum stress and yield stress are fallen and are shown in Table 2, and wherein " nothing " clauses and subclauses show that no observable surrender is fallen in engineering stress-strain curve, that is, yield stress is fallen and equalled zero.According to the present invention, bright these elastomeric materials of the yield stress petition of surrender among the embodiment 5,7,9 and 11 at room temperature with table 1 in characteristic technology strain rate under stability problem will appear during stretching; Yet, the yield stress petition of surrender among the embodiment 6,8,10 and 12 bright with these materials be heated to about 40 ℃ will the characteristic technology strain rate in table 1 under stretching minimization or eliminate stability problem.These results with these elastic material slow recovery stretch laminates consistent (embodiment 1 to 4).

Table 2: the tensile yield of slow recovery elastic materials is * as a result

Embodiment number	Average thin film basic weight (gram/square metre)	Extension test chuck speed (inch per minute)	The extension test temperature (℃)	Average yield stress (MPa)	Average surrender back minimum stress (MPa)	(MPa) falls in average yield stress	(%) falls in average yield stress
Embodiment number	Average thin film basic weight (gram/square metre)	Extension test chuck speed (inch per minute)	The extension test temperature (℃)	Average yield stress (MPa)	Average surrender back minimum stress (MPa)	(MPa) falls in average yield stress	(%) falls in average yield stress	??5	??129	??15	??22	??1.01	??0.63	??0.38	??38
??6	??123	??15	??40	??0.37	??0.36	??0.01	??2.7	??5	??129	??15	??22	??1.01	??0.63	??0.38	??38
??6	??123	??15	??40	??0.37	??0.36	??0.01	??2.7	??7	??144	??15	??22	??0.76	??0.57	??0.19	??25
??8	??158	??15	??40	??0.21	Do not have	??0.0	??0.0	??7	??144	??15	??22	??0.76	??0.57	??0.19	??25
??8	??158	??15	??40	??0.21	Do not have	??0.0	??0.0	??9	??130	??62	??22	??1.62	??0.87	??0.75	??46
??10	??126	??62	??40	??0.63	??0.50	??0.13	??21	??9	??130	??62	??22	??1.62	??0.87	??0.75	??46
??10	??126	??62	??40	??0.63	??0.50	??0.13	??21	??11	??140	??50	??22	??1.01	??0.67	??0.34	??34
??12	??159	??50	??40	??0.31	Do not have	??0.0	??0.0	??11	??140	??50	??22	??1.01	??0.67	??0.34	??34

^*For each meansigma methods among embodiment 5,7,8 and the 10-12, for each the meansigma methods in embodiment 6 and 9 based on 7 samples based on 5 samples.

Two circulations of laminated material (embodiment 1 to 4) are fitted to test and are carried out under 22 ℃ and 37 ℃ among the two circulation applying test-table 1 of slow recovery stretch laminate.Table 3 is illustrated in second circulation several fit strained average off-load power and the percentage ratio coefficient of variation of load laminated material not for 22 ℃ probe temperature, and table 4 item is for 37 ℃ probe temperature.With these results of stretch zones result combinations in the table 2 slow recovery stretch laminate produced according to the invention (table 3, embodiment 2 and 4, and table 4 are shown, embodiment 2 and 4) than those reliable more (table 3 not produced according to the invention, embodiment 1 and 3, and table 4, embodiment 1 and 3).

Table 3: the slow recovery stretch laminates of testing test under 22 ℃ for fitting with two circulations Second circulation is unloaded Lotus power ^*

^*Average off-load power and %COV (the percentage ratio coefficient of variation) are based on 9 parallel assays of each embodiment, except embodiment 15 has parallel assay 11 times.

Table 4: the slow recovery stretch laminates of testing test under 37 ℃ for fitting with two circulations The second circulation off-load power ^*

Embodiment 21 to 23 be intended to illustrate for the concrete slow recovery stretch laminate sampling of every based article element of the relevant institute of above " reliably " definition reference, test and the calculating of the percentage ratio coefficient of variation.

Embodiment 21

This embodiment shows the calculating for the percentage ratio coefficient of variation of following situation: wherein absorbent article comprises a goods element that contains slow recovery stretch laminate, and wherein the packing of consumer's size comprises five or more a plurality of absorbent article.For example, if package of absorbent articles comprises 24 disposable diapers and each diaper has the lower limb hoop of being made by slow recovery stretch laminate, then will select five diapers at random from these 24, the lower limb hoop of being paid close attention to will carefully take off from the same position on each of five absorbent articles of selecting at random; Will be respectively recover test lower limb hoop slow recovery stretch laminate is measured in the off-load power under 37 ℃ and the initial strain after 22 ℃ of following 15 seconds according to lag behind test and elongation back of two circulations.Each gained result in five diapers is illustrated as shown in table 5, together with each corresponding arithmetic mean of instantaneous value, standard deviation value and percentage ratio coefficient of variation of measuring.In table 5, arithmetic mean of instantaneous value calculates according to formula [10]

\overset{&OverBar;}{x} = \frac{1}{n} Σ_{i = 1}^{n} x_{i} = \frac{x_{1} + x_{2} + \cdot \cdot \cdot + x_{n}}{n} - - - [10]

Wherein

Be arithmetic mean of instantaneous value, n is test specimens given figure (being 5 among this embodiment), x _iFor to the measured value of i test sample in off-load power under 37 ℃ or the initial strain after 22 ℃ of following 15 seconds.In table 5, standard deviation calculates according to formula [11]

σ = \sqrt{\frac{1}{n} Σ_{i = 1}^{n} {(x_{i} - \overset{&OverBar;}{x})}^{2}} - - - [11]

Wherein σ is a standard deviation.In table 5, the percentage ratio coefficient of variation is calculated according to formula [12]

% COV = (100) \frac{σ}{\overset{&OverBar;}{x}} - - - [12]

Wherein %COV is the percentage ratio coefficient of variation.

Table 5:

	Goods element=lower limb hoop	Goods element=lower limb hoop
	Goods element=lower limb hoop	Goods element=lower limb hoop		Off-load power under 37 ℃	Initial strain percentage ratio after 22 ℃ of following 15 seconds
Test absorbent article 1	??0.23N/(g/m)	??50％		Off-load power under 37 ℃
Test absorbent article 1	??0.23N/(g/m)	??50％	Test absorbent article 2	??0.25N/(g/m)	??52％
Test absorbent article 3	??0.26N/(g/m)	??48％	Test absorbent article 2	??0.25N/(g/m)	??52％
Test absorbent article 3	??0.26N/(g/m)	??48％	Test absorbent article 4	??0.23N/(g/m)	??47％
Test absorbent article 5	??0.21N/(g/m)	??55％	Test absorbent article 4	??0.23N/(g/m)	??47％
Test absorbent article 5	??0.21N/(g/m)	??55％	Arithmetic average	??0.24N/(g/m)	??50％
Standard deviation	??0.019N/(g/m)	??3.2％	Arithmetic average	??0.24N/(g/m)	??50％
Standard deviation	??0.019N/(g/m)	??3.2％	The percentage ratio coefficient of variation	??7.9％	??6.4％

Embodiment 22

This embodiment shows the calculating for the percentage ratio coefficient of variation of following situation: wherein absorbent article comprises two goods elements that contain slow recovery stretch laminate, and wherein the packing of consumer's size comprises and is less than five absorbent articles.For example, if package of absorbent articles comprises two disposable diapers and each diaper has lower limb hoop that comprises slow recovery stretch laminate and the elasticated topsheet that comprises slow recovery stretch laminate, then will from least three these type of packings (for example, same batch, same size etc.) of combination, select five diapers at random.The lower limb hoop of being paid close attention to will be from five absorbent articles of selecting at random each on same position carefully take off, and the elasticated topsheet of being paid close attention to also carefully takes off the same position in five absorbent articles of selecting at random each.Will be respectively recover test in lower limb hoop and the elasticated topsheet slow recovery stretch laminate each is measured in the off-load power under 37 ℃ and the initial strain after 22 ℃ of following 15 seconds according to lag behind test and elongation back of two circulations.Each gained result in five diapers is illustrated as shown in table 6; Arithmetic average, standard deviation and the percentage ratio coefficient of variation utilize formula [10] to [12] to calculate respectively.

Table 6:

	Goods element=lower limb hoop	Goods element=lower limb hoop	Goods element=elasticated topsheet	Goods element=elasticated topsheet
	Goods element=lower limb hoop	Goods element=lower limb hoop	Goods element=elasticated topsheet	Goods element=elasticated topsheet		Off-load power under 37 ℃	Initial strain percentage ratio after 22 ℃ of following 15 seconds	Off-load power under 37 ℃	Initial strain percentage ratio after 22 ℃ of following 15 seconds

	Goods element=lower limb hoop	Goods element=lower limb hoop	Goods element=elasticated topsheet	Goods element=elasticated topsheet
	Goods element=lower limb hoop	Goods element=lower limb hoop	Goods element=elasticated topsheet	Goods element=elasticated topsheet	Test absorbent article 1	??0.23N/(g/m)	??50％	??0.34N/(g/m)	??100％
Test absorbent article 2	??0.25N/(g/m)	??52％	??0.33N/(g/m)	??110％	Test absorbent article 1	??0.23N/(g/m)	??50％	??0.34N/(g/m)	??100％
Test absorbent article 2	??0.25N/(g/m)	??52％	??0.33N/(g/m)	??110％	Test absorbent article 3	??0.26N/(g/m)	??48％	??0.36N/(g/m)	??105％
Test absorbent article 4	??0.23N/(g/m)	??47％	??0.36N/(g/m)	??96％	Test absorbent article 3	??0.26N/(g/m)	??48％	??0.36N/(g/m)	??105％
Test absorbent article 4	??0.23N/(g/m)	??47％	??0.36N/(g/m)	??96％	Test absorbent article 5	??0.21N/(g/m)	??55％	??0.35N/(g/m)	??104％
Arithmetic average	??0.24N/(g/m)	??50％	??0.35N/(g/m)	??103％	Test absorbent article 5	??0.21N/(g/m)	??55％	??0.35N/(g/m)	??104％
Arithmetic average	??0.24N/(g/m)	??50％	??0.35N/(g/m)	??103％	Standard deviation	??0.019N/(g/m)	??3.2％	??0.013N/(g/m)	??5.3％
The percentage ratio coefficient of variation	??7.9％	??6.4％	??3.7％	??5.1％	Standard deviation	??0.019N/(g/m)	??3.2％	??0.013N/(g/m)	??5.3％

Embodiment 23

This embodiment shows the calculating for the percentage ratio coefficient of variation of following situation: wherein absorbent article comprises goods element and second goods element that contains two kinds of slow recovery stretch laminates that contains a kind of slow recovery stretch laminate, and wherein the packing of consumer's size comprises and is less than five absorbent articles.For example, if package of absorbent articles comprises 2 disposable diapers and each diaper has lower limb hoop of being made by a kind of slow recovery stretch laminate and the elasticated topsheet of being made by two kinds of slow recovery stretch laminates, then will from least three these type of packings (for example, same batch, same size etc.) of combination, select five diapers at random.The lower limb hoop of being paid close attention to will carefully take off from the same position on each of five absorbent articles of selecting at random, to carefully take off from the same position on each of five absorbent articles of selecting at random from first slow recovery stretch laminate of the elasticated topsheet of being paid close attention to, and will carefully take off from the same position on each of five absorbent articles of selecting at random from second slow recovery stretch laminate of the elasticated topsheet of being paid close attention to.Will be respectively recover test in lower limb hoop and the elasticated topsheet slow recovery stretch laminate each is measured in the off-load power under 37 ℃ and the initial strain after 22 ℃ of following 15 seconds according to lag behind test and elongation back of two circulations.Each gained result in five diapers is illustrated as shown in table 7; Arithmetic average, standard deviation and the percentage ratio coefficient of variation utilize formula [10] to [12] to calculate respectively.

Table 7:

	Goods element=lower limb hoop	Goods element=lower limb hoop	Goods element=elasticated topsheet (No. 1 slow recovery stretch laminate)	Goods element=elasticated topsheet (No. 1 slow recovery stretch laminate)	Goods element=elasticated topsheet (No. 2 slow recovery stretch laminates)	Goods element=elasticated topsheet (No. 2 slow recovery stretch laminates)
	Goods element=lower limb hoop	Goods element=lower limb hoop						Off-load power under 37 ℃	Initial strain percentage ratio after 22 ℃ of following 15 seconds	Off-load power under 37 ℃	Initial strain percentage ratio after 22 ℃ of following 15 seconds	Off-load power under 37 ℃	Initial strain percentage ratio after 22 ℃ of following 15 seconds
Test absorbent article 1	??0.23N/??(g/m)	??50％	??0.34N/??(g/m)	??100％	??0.32N/??(g/m)	??105％		Off-load power under 37 ℃		Off-load power under 37 ℃		Off-load power under 37 ℃
Test absorbent article 1	??0.23N/??(g/m)	??50％	??0.34N/??(g/m)	??100％	??0.32N/??(g/m)	??105％	Test absorbent article 2	??0.25N/??(g/m)	??52％	??0.33N/??(g/m)	??110％	??0.31N/??(g/m)	??107％
Test absorbent article 3	??0.26N/??(g/m)	??48％	??0.36N/??(g/m)	??105％	??0.29N/??(g/m)	??110％	Test absorbent article 2	??0.25N/??(g/m)	??52％	??0.33N/??(g/m)	??110％	??0.31N/??(g/m)	??107％
Test absorbent article 3	??0.26N/??(g/m)	??48％	??0.36N/??(g/m)	??105％	??0.29N/??(g/m)	??110％	The test absorbent article	??0.23N/??(g/m)	??47％	??0.36N/??(g/m)	??96％	??0.29N/??(g/m)	??115％
??4							The test absorbent article	??0.23N/??(g/m)	??47％	??0.36N/??(g/m)	??96％	??0.29N/??(g/m)	??115％
??4							Test absorbent article 5	??0.21N/??(g/m)	??55％	??0.35N/??(g/m)	??104％	??0.33N/??(g/m)	??104％
Arithmetic average	??0.24N/??(g/m)	??50％	??0.35N/??(g/m)	??103％	??0.31N/??(g/m)	??108％	Test absorbent article 5	??0.21N/??(g/m)	??55％	??0.35N/??(g/m)	??104％	??0.33N/??(g/m)	??104％

	Goods element=lower limb hoop	Goods element=lower limb hoop	Goods element=elasticated topsheet (No. 1 slow recovery stretch laminate)	Goods element=elasticated topsheet (No. 1 slow recovery stretch laminate)	Goods element=elasticated topsheet (No. 2 slow recovery stretch laminates)	Goods element=elasticated topsheet (No. 2 slow recovery stretch laminates)
	Goods element=lower limb hoop	Goods element=lower limb hoop					Standard deviation	??0.019N/??(g/m)	??3.2％	??0.013N/??(g/m)	??5.3％	??0.018N/??(g/m)	??4.4％
The percentage ratio coefficient of variation	??7.9％	??6.4％	??3.7％	??5.1％	??5.8％	??4.1％	Standard deviation	??0.019N/??(g/m)	??3.2％	??0.013N/??(g/m)	??5.3％	??0.018N/??(g/m)	??4.4％

For example, the dimension that is disclosed as " 40mm " is intended to expression " about 40mm ".On the contrary, except as otherwise noted, each such dimension all is meant the numerical value of being quoted and centers on the scope that is equal on the function of this numerical value.For example, the dimension that is disclosed as " 40mm " is intended to expression " about 40mm ".

The All Files of quoting in detailed Description Of The Invention all is incorporated herein with way of reference in relevant portion.Should not be interpreted as admitting that for quoting of any file it is relevant prior art of the present invention.When any implication of term in any implication of term among the present invention or definition and the file of incorporating this paper with way of reference into or when defining contradiction, should obey the implication or the definition of giving this term in the present invention.

Though illustrated and described particular of the present invention, be apparent that for a person skilled in the art, under the situation that does not break away from the spirit and scope of the invention, can make a plurality of other changes and modification.Therefore, claims all such changes and modification of being intended to be included in the scope of the present invention.

Claims

1. package of absorbent articles, described package of absorbent articles comprises:

Be included in a plurality of absorbent articles in the described packing, each absorbent article in the wherein said packing comprises:

A) top flat;

B) egative film that engages with described top flat;

C) be inserted in absorbent cores between described top flat and the egative film; With

D) goods element;

At least one the goods element that wherein is used for each absorbent article in the described packing comprises slow recovery stretch laminate, described stretch laminate show under 37 ℃ about 0.16N/ (g/m) or bigger off-load power and 22 ℃ down recovery show about 10% or bigger initial strain percentage ratio after 15 seconds; And

Wherein said slow recovery stretch laminate shows less than about 15% the percentage ratio coefficient of variation and for the percentage ratio coefficient of variation that shows 22 ℃ of initial strains after recovering for 15 seconds down less than about 15% for the off-load power under 37 ℃.

2. packing as claimed in claim 1, wherein said goods element is selected from the group of being made up of following: anus hoop, elasticated topsheet, fastening system, lower limb hoop, waist elasticity assembly, lateral plate, auricle, outer covering piece and their combination.

3. the described packing of each claim as described above, the slow recovery stretch laminate that wherein is used for each absorbent article in the described packing shows about 30% or bigger initial strain percentage ratio after recovering for 15 seconds down at 22 ℃.

4. the described packing of each claim as described above, the slow recovery stretch laminate that wherein is used for each interior absorbent article of described packing recovers down to show initial strain percentage ratio after 15 seconds at 32 ℃, and wherein the difference between initial strain percentage ratio after recovering for 15 seconds under 22 ℃ and the initial strain percentage ratio after recovering for 15 seconds under 32 ℃ is greater than about 5%.

5. the described packing of each claim as described above, each absorbent article in the wherein said packing is selected from: diaper, training pants, pull-on garment, refastenable trousers, adult incontinence products or feminine care.

6. the described packing of each claim as described above, the elastic component of slow recovery stretch laminate that wherein will be used for each absorbent article in the described packing before described elastic component stretches and/or during pretreatment.

7. package of absorbent articles as claimed in claim 6, the pretreatment of elastic component that wherein is used for the slow recovery stretch laminate of each absorbent article in the described packing is selected from: heating, prestretched, increase progressively and stretch and their combination.

8. as claim 6 or 7 described package of absorbent articles, the elastic component of slow recovery stretch laminate that wherein will be used for each absorbent article in the described packing before described elastic component stretches and/or heating to about 30 ℃ to about 100 ℃ temperature.

9. as claim 6,7 or 8 described package of absorbent articles, the elastic component that wherein is used for the slow recovery stretch laminate of each absorbent article in the described packing shows following one or more characteristics:

(i) about 0.3MPa or littler yield stress are fallen under the characteristic strain rate of described drawing process and characteristic temperature;

(ii) under the characteristic strain rate of described drawing process and characteristic temperature about 30% or littler percentage ratio yield stress fall;

(iii) fall at about 0.15MPa under the incipient extension strain rate of the characteristic strain rate that equals described drawing process and under the characteristic temperature of described drawing process or littler yield stress; And

(iv) under the incipient extension strain rate of the characteristic strain rate that equals described drawing process and under the characteristic temperature of described drawing process about 20% or littler percentage ratio yield stress fall.

10. the described packing of each claim as described above, wherein said slow recovery stretch laminate show less than about 10% the percentage ratio coefficient of variation and for 22 ℃ of initial strains that recover down after 15 seconds for the off-load power under 37 ℃ and show the percentage ratio coefficient of variation less than about 10%.